I am uploading documents to Document Library using copy web service. I need to update read only fields like created, created by, modified, modified by, version,.. I changed the read only property of those fields to false and updated the values, but i can't update for created by and modified by fields. How to do this?

Also i used DWS web service to create new folder in Document Library. Here also i need to update those values. How to achieve this. Is there any similar property like Field Information in DWS web service??

could you add your code so we can see what might be the problem?
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lem.mallariMay 13 '13 at 5:43

FieldInformation i1 = new FieldInformation { DisplayName = "Created By", InternalName = "Author", Type = FieldType.User, Value = "userid;#username" }; I am getting no error and content also not updated. Created By field is updated with credential that i used for this web service and not with new user i mentioned here.
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surenMay 13 '13 at 5:57

It might be easier to edit your question to include the code (formatted) rather than add using a comment.
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SPDoctor♦Jun 24 '13 at 14:51